--- a/tests/test-amend.t	Sat Jun 21 18:31:21 2014 -0400
+++ b/tests/test-amend.t	Sun Jun 22 12:01:11 2014 -0400
@@ -92,3 +92,8 @@
   \d+ (re)
   \d+ 0 rev6 (re)
   \d+ (re)
+
+Specify current user as committer with -U
+  $ HGUSER=newbie hg amend -U
+  $ hg parents --template '{rev}  {author}\n'
+  7  newbie